Fluid pressure control apparatus for free piston machines



Aug. 26, 1952 A. J. BENT 2,608,052

FLUID PRESSURE CONTROL APPARATUS FOR FREE PISTON MACHINES Filed July 22, 1947 5 Sheets-Sheet 1 INVENTOR. Y Arthur J'Beni an mmm 9m Em bww Om own 05 mom wmm 00w onw wwm mvwm Now NN @NN mQN fivm um EN now EN MN ATT 012MB Y 4 Aug. 26, 1952 A. J. BENT 2,608,052

FLUID PRESSURE CONTROL APPARATUS FOR FREE PISTON MACHINES Filed July 22, 1947 5 Sheets-Sheet 2 IN V EN TOR.

BY Afzhur JBent dam ATTORNEY 5 Sheets-Sheet f5 A. ,1. BENT 02 2 2 ILY :58 m9 *5 mt FLUID PRESSURE CONTROL APPARATUS FOR FREE PISTON MACHINES Filed. July 22, 1 47 Aug. 26, 1952 NEH 5? PW mLJwmdL mocnom mw( m wm mcmccsm ELo w@ Q mo S. 8 Wm 7 mm 8 5 mm 8 mm mm 6 no om an mm wa 4 8 \b ow 8 3 mm IN V EN TOR. BY Arthur JBent ATTOBZEY A. J. BENT 2,608,052

FLUID PRESSURE CONTROL APPARATUS FOR FREE PISTON MACHINES Aug. 26, 1952 5 shee s sheet 4 Filed July 22, 1947 INVENTOR.

ATTOEZVEY n Arihuz JBent N O N i l ha,

Aug. 26, 1952 A. J. BENT 2,608,052

LUID PRESSURE CONTROL APPARATUS FOR FREE PISTON MACHINES Filed July 22, 1947 S Sheets-Sheet 5 IN V EN TOR.

ATTDRNE Y Patented Au 26,1952

FLUID PRESSURE CONTROL APPARATUS FOR FREE" PISTON MACHINES Arthur J. Bent, Penn Township,. Allegheny County, Pa., assignor to Westinghouse Air Brake Company, a corporation of Pennsylvania Application July 22, 1947, ser'ial-iNbf'zeavi-i (01. -44). I

This invention relates to control apparatus for free piston machines, particularly of the gas generator type, embodying two oppositely arranged motor operated air compressor portions each em: bodying an internal combustion operated-power piston and a ,coaxially arranged andrigidly connected air compressor piston operative by said power piston to compress air for scavenging and feed of the motor part of the machine andin which the mixture of the hot gases of combustion and of the excess of scavenger'air discharged I from the motor part of the machine form together generated motive gas which may be employed toperform mechanical work as byexpansion in .a turbine.

38 Claims.

In Patent No. 2,406,037 issued on August 20,

1946, to R. P. Ramsey, there is disclosed a free piston machine of this general type, and one object of the invention is the provision of improved means for controlling starting and/or running of such a machine. Y The machine disclosed in the Ramsey patent embodies two oppositely and coaxially arranged motor compressor units each embodying a piston assembly comprising a power piston, an air compressor piston and a direct bounce piston. Be-v tween the two power pistons is a power or 'c'om,-' bustion chamber into which fuel is adapted to be injected for compression ignition for driving said pistons apart. At the outer face of each air compressor piston is an air compressing chamber and said piston is operative by the respective power piston to compress air from'said chamber into a-scavenger receiver for the purpose above set forth. Atthe outer face of each direct bounce piston is what may be called a direct bounce chamber in which air is adapted to be compressed uponthe air compressing stroke of the respective power piston to provide energy for returning the piston assembly, following scavenging, to its. in ner position preceding another power stroke. At the inner face of each air compressor piston is what may be called a reverse bounce chamber which is employed in connection with starting the machine and in which the amount of air is arranged to be varied for regulating, in addition to the usual regulation resulting from variations in fuel supply, frequency of reciprocation'of the piston assemblies. The regulation of fuel supply to the machine forms no part of the present invention.

Another object of the invention is the provision of improved means controlled by pressure of air in the scavenger receiver and the stroke of the piston assemblies for automatically regulating the amount of ,air in direct bounce chambers and thereby the energy thereof to return said as,- semblies in the direction of, their inner dead points or firing positions, as required to maintain an output of motive gas corresponding to anormal consumption thereof. I v

Another object of the invention is the provision of improved means for regulating the amount of air in the reverse bounce chambersior regulat ing frequencyof reciprocationof the piston asmb es;- v vAnother object of the invention is the ipro vision of improved control apparatus for {a machine such as the gas generator above mentioned embodying. a singleoperators,.contro1 device for controllingv starting thereof and for regulating the amountof air in the reverse bounce chambers to control the frequency of operation of the piston assemblies, and further embodying a iii: rect bounce governor device automatically ope'r ative to control the amount of air in the direct bounce chambers for regulating the strokeof the piston assemblies in the direction of theirinner dead points as require'd to maintain an outputot motive gasequal Ito. the normal consumption thereof.

Other objects and advantages willsappear the. followingmore ..detailed description of, the invention. A i I In the accompanying drawings Figs. 1-'1A, when arranged with the right hande'nd of Fig.1 against the left handend of Fig. 1A, is a diagram matic view partly in section and partly in, outline, of a control apparatus. embodying theinvent'ion; Fig. 2 is a sectional or diagrammatic view, maim' in section, of an operators control device shown in elevation in Fig. 1; Figs. 3 and 4 .are sectional views taken on the lines 33 "and 4-4 i'n'Fig. '2; Fig. 5 is a sectional view taken on the line 5-15 in Fig. 3; Fig. 6 is a plan view of a portionof the operators control device taken in -the'direction of arrow 6 in Fig.2; Fig.7 is a slightly enlarged view of a portion of the operators-control 'device.

' shown in Fig. 2.; Fig. 8 is a diagrammatic sectional view. of a so-called direct bouncegovernor device shown in elevation in Fig. l, and 9 is asectional. view of a so-called pick-oft valve device shown in elevation in Fig. l. g v

N DE$ I Q i As". shown in the drawings, the reference meral l designates a'free pistonmachinebf the ga generator type which may be substantially the same in structure as th at disclosed inf i111? aforementioned Ramsey patent, and which is em 7 pressor pistons said gas generator,- a direct bouncegovernor 4 for automatically regulating the amount or quantity of air in direct bounce chambers of said generator, and other apparatus particularly pointed out. a

Description of gas generator The gas generator I comprises a casing containing two coaxial and oppositely arranged like power pistons 5, 5a between which is provided a power or combustion chamber 6 and which are adapted to cooperate, respectively, when close to the outer end of their strokes, with inlet and outlet ports 7 and 8 for said chamber. The inlet port I, only one ofwhich'is' shown in the drawing, is open to ascavenger air receiver '9. while the outlet portB, only one of which is shown in the drawing, is connected'to a delivery pipe ID for the'generated motive gas-which pipe may communicate with the inlet toa gas turbinelnot shown). Reference numeral II designates a fuel injector nozzle for delivering fuel to the combustion orpower chamber 6. The means for regulating the fuel to the injector nozzle II are not shown in the drawing since, as before mentioned. the fuel control means constitutes no part of the invention. I '1 I Two air compressor pistons I2, IZa are disposed at ,opposite sides of and rigidly connected to the power pistonsB, 5a, respectively, in coaxial relation therewith. At'the inner face of each compressor piston I2, 12a is a reverse bounce chamber I3, the two chambers I3 being in permanent communication through a conduit I4. At the opposite face of'eachcompressor piston I2, IZa is an air'compressing'chamber I5 having an inlet from atmosphere by way of an inlet valve I6 and having an outlet or discharge past a discharge valveI'I to the scavenger air receiver 9. V

Projecting from the outer face of the-com- I2, I2a through the air compressing chambers I5 and into suitable bores in the casing, are respectively, rigidly conected and coaxially. arranged ,direct bounce pistons I8, I8a the outer end of each of which cooperates with thecasing to form a direct bounce chamber I9, eachv direct bounce piston and its chamber I9 constituting a cushion means. The two direct bounce chambers I9 are in permanent communication with each other through a conduit 20; The connection between each direct bounce chamber I9 andtheconduit 20 is by way of one or more passages 3I and a chamber 32 in the casing constituting a part of the direct bounce chamber I9. The passages 3| open tochamber IS a slight distance, in from the outer end wall of chamber I9 to provide between said wall and passages a safety, cushion space 33 into which the respec tive direct bounce piston is adapted to move only in starting. 7 Y

The piston assembly comprising the 1 power piston 5, air compressor piston I2 and direct bounce piston I8 constitute one power operated air compressing unit, while the other pistons 5a, I2aand I8a constitute a piston assembly of another, identical butoppositely arranged air com-. pressingunit, and the two assemblies are con nected together for symmetrical movementby to be hereinafter .ber 28 to open said valve.

any suitable'synchronizing mechanism such as two oppositely arranged toothed racks 2| and 22 connected at one end to th'e'air compressing pistons I 2, I2a, respectivelyyand operatively con nected to each other bya meshing pinion 23 arranged to turn on a fixed axis.

Oneor more starting valve devices 24- are associated with the casingjforeach reverse bounce chamber I3, each starting valve device comprising a vent valve 25 arranged to open inwardly of said chamber for establishing a vent from said chamber to atmosphere by way of a passage 26. A piston 21 connected to valve 25 is arranged to beoperated by fluid under pressure in a cham- A spring 29 acts on piston 2'I to close valve 25 when fluid under pressure is released from chamber 23. The chambers28 in all of'the starting'valve devices 24 are connected to a common control pipe 30.

The gas generator I, thus far described, and constituting no part of the present invention, is

, adapted to operate as follows. Starting with the twofpiston assemblies in the position in which theyare shown in' the drawing, fluid under pr'essurej'will be supplied to the reverse bounce chambers I 3 at apressure sufficient to move said piston assemblies apart to their outermost end posi-v tions in which the inlet and exhaust ports 1 and 8, respectively, to the power chamber 5 are open and'the outer ends of the direct bounce pistons I B, I8a are disposed in the respective safety spaces 33 in substantial contact withthe end walls of chambers H. The two chambers 32 will then be charged'with fluid atsuitable pressure which will become effective in the safety spaces 33 over the outer ends of the two direct bounce pistons I8, I8a,fo1lowing. which, the vent valves 25 of the severalfstarting valve devices 24will be simulta-' 'neously] opened to establish large vent openings frorn'the reverse bounce chambers I3. The pressure in the reverse bounce chambers I3 will then, suddenly reduce and permit the pressure of fluid in safety spaces 33 and chambers 32 to ex-. pand into the direct bounce chambers I9 and actuate the direct bounce pistons I8, IBa to drive the two piston assemblies toward each other; the power pistonsi, 5a first closing'communication between power chamber 6 and the. inlet and outlet, ports I and 8 and then compressing the air between said pistons in said power chamber. As the power pistons 5, '50 approach their inner deadpointfuel will be introduced through the injector nozzle I I into the combustion space 6 and then by compression said fuel will be ignited and the expansion of the combustion products in said chamber will stop further inward movement of said piston assemblies and drive said piston assemblies apart, a portion of the energy thus imparted to the piston assemblies being absorbed by recompressionof the air' in the direct bounce chambers I9. v

On the inward stroke of the piston assemblies air willbe drawn into the air compressing cham- I Finally, ,thepower piston 5 will uncoverthe outlet port 8 and a little later the piston 5c will uncover the {inlet port l-from the scavenger air receiver 8, and air from said receiver will then sweep through the combustion or power chamber. 6 to remove the products of combustion therefrom and to fill said chamber withfresh .air from the scavenger receiver 9. '-It will be apparent that upon starting'the generator I, the air in the scavenger receiver 9'for'scavenging the combustion chamber .6 will be only slightly in excess of atmospheric pressure. J

Attthe completion ofthe power stroke of the two'piston assemblies; the energy of the compressed air in the direct bounce chambers willdrive the two piston assemblies toward each other again andthe cycle of operation, above described, willthen be repeated.

In starting and during a warming-up period for; the generator I, the delivery pipe ill will usually be open directly to atmosphere during which time there will be no material increase in pressure in the scavenger receiver 9,but when the' 'atmospheric connection is closed and the motive gas discharged from .the generator is directed to the-turbine; the continued operation of .the generator will build up a pressure in the scavenger receiver and the pressure of the discharged motive gas will correspondingly increase to that desired.

As the pressure of air compressed into the scavenger receiver increases, a proportional amount of energywill be retained at the end of the air compressing stroke in the air compressing chambers l5 by the compressed air in the clearance space at the outer faces of the compressor pistons 12, which energy will coact with that of the compressed air in the direct bounce chambers I!) to urge the piston assemblies toward their inner dead points or firing'p'osition. At the same time, however, the pressure of the fresh air chargein the power or combustion space 6, at the time the power pistons 5, 5a close the 'outlet' and inlet ports 8 and 1, respectively, will increase with scavenger air pressure and provide an increased force opposing such inward movement. Further, the vent valves 25 will close at a certain position of the initial inward stroke of the piston assemblies in starting, as will hereinafter be described, so as to provide in the reverse bounce chambers l3 a certain pressure, at the inner dead points of said assemblies, necessary to prevent stalling of the generator in starting, but which also will oppose such inward movement.

' Now it is desirable to vary the energy of the air. in the direct bounce chambers 19 with re spect to the opposing and coacting pressures just described in such a manner as to cause each piston assembly to move to an inner dead point corresponding" to the pressurein the scav-' enger receiver 9, and to permit movement to an outer dead point, short of the respective bounce pistons I8, 18a covering the passages 3| and entering the safety spaces 33; the'outward stroke corresponding to the amount of fu-el being supplied to the generatora. Inother words,: if the pressure of air in the scavenger. receiver 9 reduces, due to increased use of motive gas; it is desirable to increase the amount of air in'and thereby the energy of the direct bounce chambers [9, so as to move in the innerdead point of each piston assembly, and to at the same time permit a moving out of the outer dead point of said assembly due-to the usual resulting increase in fuel supply, for in turn increasing the output OfzCOlTlIJIESSSd air in proportion substantially to the reductionin pressure of the motive gas resulting from increased consumption thereof. On the other hand, as the pressure of the motive gas is restored, it is desirable to reduce the 6 amount of air in and thereby the energy-of the direct .bouncech'ambers 9 ,.in proportion,lto correspondingly reduce "the :strok'e of .ithe' piston assemblies inboth directions forproportionately reducing theoutput ofrcompressed air. It will therefore'be seen that by suitable adjust!- mentof the amount of air in .the direct bounce chambers I9 according tothe pressure of'rair .in the scavenger receiver 9, thestroke onthe piston assembliesin both'directions loan besreg-ulated as. desired, and, in accordance'w'iththeinvention, this is automatically accomplished by thedirect bounce governor 4, as will hereinafter be describedp I 1 I It .is also desirable in case of greater than a normal use of motive gas'deliverediby the'=genferatori'i to increase theoutput thereof over that I obtained by a maximum" amount of fuel andthis may be accomplished by increasing the amount of air in the reverse bouncechambers' l3 by-s'uitable adjustment of the operator's control-device 3, as will be later described. f

Description of control apparatus 2f The control apparatus 2 comprisesabracket 34 upon which is mounted the operators control device 3, as well asstartingcontrol mechanism including a shuttle or transfer valve device 325., a direct bounce chamber supply valve device 35, a feed valve device -36 ,a sequence. valve device 31, a vent valve device 38, a dump supplylvalve device139, a dump exhaust valve device 40;:three check-valves 4|, 42 and '43,:and' an adjustable choke-44. 'A sequence olume .45 z is .=provided; in a casing part attached to one end. of bracket". 34;

The" operator's control device.;3 comprisesa reverse bounce chamber governor portion 46 and a starting valve portionor device 4.!

The; governor portion '46 comprises i.a'"casin'g containing a flexible .diaphragm...48 subject.on on'epside to atmosphericp'ressure ma chamber 49 which is open to atmosphere through a passage 50., At the opposite side of 'diaphragmfi lflds'a control chamber 5|: open through a pipe 52 :and pick-off valve device 53'to-. pipe I4'connecting together the reverse bounce chambers 13.

Adiaphragm follower 54 contained 'in :cham ber5 I". and engagingyo'ne side ofdiap'hrag'm 48 has a stud'portion 5.5extending from one side thereof centrally through said diaphragm and secured by screw-"threaded engagement-t0 a sleeve 56* disposed in chamber 491.; The sleeve: 56 is provided at one. end with an annular .collar 51 engaging I chambers 43. 'Sealin'g'frings 66 provided in the partition walls '69 and '62 have sealing and sliding contact with the sleeve 59 for preventing leakage of fluid under pressure from chambers 5| and E3 to chamber 6| which latter chamber 'is open to atmosphere through a passage 61'. A'delivery' pressure, regulating spring G8'contained in chain-'- ber 49 acts onthe diaphragm 48 for-urging it in the direction of partition wall 60. i A post 69 secured at one end to the diaphragm follower 54extends centrally through :the sleeve.

the open end of sleeve 59.-

59 to. a. point in chamber 631beyond the end of said sleeve, while'secured to the opposite end of said post in said chamber is the closed end of a cylinder ID the opposite open end of whichis disposed adjacent and in coaxial relation with Slidably mounted in cylinder 101s a fluid pressure release valve "H arranged to cooperate with the end" of sleeve 59,

constituting a seat for. said valve, to control communicationbetween chamber 93' and the interior of sleeve 59 which is openthrough one'or more ports 12 in said. sleeve to the atmospheric chamberiGI; A spring'73 contained in a chamber H formed between valve II and the closed end of cylinder I acts on said valve Turging it toward. its seat. Chamber I4 is open through a small portz15 in the closed end of cylinder T0 tochamber 63. The valve II has a stem 15 slidably m'ountedon the'po'st 69. y

.Thepost 69 has a through axial bore-andslidably mounted in this bore is a plunger 11 having an axial bore 18 closedat opposite ends of the plunger. Near one end theplunger I! has one or more radial ports 19 establishing a constantly open communication between bore 18 and one or more radial ports '80 provided in the post 69 and opening to chamber It. Near the opposite end the plunger 1'! has one or more ports 'BI connecting said borev to .a release pilot valve chamber 82, it being therefore noted that chamber 82 and the releasevalve chamber I4 are in constant communication. 'A pilot release valve 83contained in chamber 82 is arranged to control communication between said chamber and the atmospheric chamber 49 by way of a plurality of ports 84in a seat member 85; a chamber 86 and a plurality of ports 81 in an equalizing member 88. The pilot valve 83 has'a stem 89 extending through a suitable guide bore in seat member 95 into. chamber 86 whereinit engages one side of an'apertured spring follower 90. One end of a *precompressed spring 9I' contained in chamber 85 engages the opposite sidezof follower 90, while 7 the opposite end of saidsprin'gis supported on a nut 92 adjustably mounted 'in the equalizing member 88. This spring is provided for unseating the release pilot valve 83 and for concurrently shifting the plunger ll-axially in post 69. Movementof plunger H in the opposite direction is adapted to seat the'pilot release valve 83.

The equalizing member 88 has one end connected to the sleeve. 56 which is secured to the diaphragm 48 for movement therewith. A balancing piston 93 is formed on the opposite end of equalizing member 88 and carries a sealing ring 94 having sealing and sliding contact with the wall of a bore in the casing,- said piston separating a pressure chamber 95 at one side from a non-pressure chamber 95 at the opposite side which latter chamber is open to the atmospheric chamber 49 as by way of a passage 91'. Chamber 95 is, in constant communication through a-pasparts and-of the interconnecting parts above described.

The end of chamber 63 opposite that through V which extends the sleeve'59 is closed by a casing part 99 having 'a'through bore and mounted in said bore in coaxial relation to said sleeve is. a

bushing I00. This-bushing has at the end adjacent chamber 63 an annular stop collar. Ifll seating in a recess in the casing portion 99, while engaging the opposite and outerside of the casing part and having screw-threaded engagement-with an extended part of saidbushing-is a securing nut I02 for holding thebushing in place. "A number of sealing rings I03 spaced from'veach other are carried by the bushing I00 andhave sealing contact withthe wall of the bore in which said bushing is disposed to prevent leakage of fluid under pressure betweenchamber 63 and various passages tobe hereinafter mentioned.

Slidably mounted in the bushing I00 is. a plunger I04 having at one end a stem I05 of smaller diameter extending through a bore in an inwardly extending collar I 06 provided on the bushing I adjacent'its. outer end. i A sealing ring I01 carried bycollar I06 engages stem I05 for preventing leakage of fluid under. pressure along said stem from a balancing chamber I98 formed between the outer end of plunger I04 and the adjacent surface of collar I06. The plunger I04 has an axial bore closed at the end adjacent the stem I05, while the opposite end is open to chamber 63, and disposed in this bore against a shoulder I09a is a supply valve seat member I09. The member I09 is provided with a sealing ring IIO engaging the wallof the bore for preventing leakage of fluid under pressure from a supply pressure or. supply valve chamber III formed at the inner end of member I09 within said bore past said member to chamber 63. The seat member I09 is supported in place in plunger I04 by a, ring, II2 disposed in a recess in said plunger and engaged by the outer ,end of said seat member.

A main supply valve. I I3 contained in the supply valve chamber IIIis provided for seating engagement with the adjacent end of seat member I09 for controlling flow, of fluid under pressure from said chamber to chamber 63 by way of an axial bore I I9 extending part way through said member and thence through a plurality of ports I I5 provided around a central integral section IIIiof said member. Thesupplyvalve H3 is provided with an axial bore and surrounding said bore and extending into chamber :I II is. a valve seat arranged to be engaged'by a supply pilot valve III' contained in saidchamber. The pilot valve I I! is engaged by a follower IIB subject to pressure of a spring II9 for seating said pilot valve and in turn the supply valve I I3. A

pin I29 having a fluted portion I2I disposed within bore I I 4 in the seat member I09 has a coextensive fluted portion ;I22 of smaller diameter extending through the axial bore in the supplyvalve II31into' engagement with the supply pilot valve I I1, a: shoulder. I62 being formed atth'e junction of the larger and smaller fluted portions. This shoulder IE2 is spaced from the supply valve I I3 when the pilot valve II! is seated thereon but is adapted to engage and unseat said supply valve subsequent to unseating said pilot valve. The pin I20 has a bearing part I23 extending in the opposite direction from the fluted portions thereof through and in sliding contact with the axial bore in the integral section IIB of the seat member I09 into chamber 63 for engagement with the adjacent end of plunger I1.

. The supply valve chamber I I I is adapted to'be constantly supplied with fluid at a desired re duced pressure, from a feed valve device I24 through a pipe I25, a passage I26 extending through the bracket 34 and connected to a cavity I21 surrounding the bushing I and thence through one or more ports I28 in said bushing, an annular chamber I29 formed between said bushing and plunger I04 and encircling the latter, and one or more radial ports I29a in said plunger opening to chamber III.

The chamber 63 at one end of plunger I04 is open through a passage I30 to chamber I08 at the opposite end for constantly equalizing pressures of fluid therein to minimize the force required to move said plunger in the direction of chamber 63 when the latter chamber is supplied with fluid under pressure, as will be later described. Secured by a ring I3I to the plunger stem I adjacent the outer end thereof is a spring seat I32 and interposed between said seat and the bushing collar I06 is a bias spring I33 acting constantly to urge the plunger I04 outwardly of the casing. part 99.

At one side of the plunger stem I05 the casing part 99 has an integrally formed projecting arm I34 in which there is secured by a pin I35 a shaft I36 extending parallel to the axis of said stem, and mounted to turn on this shaft in a plane at right angles to the axis of said shaft and stem is an operators control lever I31.

The lever I 31 comprises an inner journaled part I38 mounted on shaft I36 and a hand grip part I39 hingedly connected together by a pin I40 to permit movement of the latter part relative to the former part in a plane only in the direction toward and away from the casing part 99.

The end of the journaled part I38 is bifurcated, and secured by a bolt IM to the shaft I36 is an element I42 disposed between the two journaled parts of the lever I31 for holding said lever on said shaft. The element I42 has an arcuate surface I43 concentric with the axis of said shaft I36. Secured to the side ofthe journaled part I38 opposite to and extending at right angles to the axis of the plunger stem I05 is a plate I44. Secured to plate I44 at one side of the journaled part I38 is a cam fulcrum element I45 to which is fulcrumed on a pin I46a one end of a rectangular like. cam element I46 disposed parallel to plate I44 at the opposite side of the journaled part I38 of the lever. A spring I41 interposed between the plate I44 and cam element I46 urges the cam element about its fulcrum pin I46a in a direction against an adjusting screw I48 adjustably carried by the plate I44 at the opposite side of said lever. A locknut I49 on screw I 48 is provided for contact with plate I44 to lock the screw I 48 in an adjusted position.

The cam element I46 has a cam surface I50 for engaging one side of a follower I'5I the opposite side of which contacts the plunger stem I05, the parts being so arranged that with the lever I31 in an extreme left-hand position, as viewed in Fig. 3 and to be hereinafter defined, the spring I 33 will urge the plunger I04 into substantial contact with the bushing collar I06, while upon movement of said lever out of this positionin a clockwise direction, as viewed in Fig. 3, said cam element will displace said plunger in the direction of chamberv63 a distance proportional to the degree of such movement. The follower I5 I is formed on one end of an arm I52 the opposite'end of which is fulcrumed on a pin I53 carried in the casing part 99.

Fulcrumed' at one end on th cam fulcrum element I45 is a friction locking shoe I54 having 10 a part disposed within the journaled part I38 of the lever and provided in one side with a concave surface for frictionally engaging the arcuate surface I43 of the element I42. Engaging the opposite side. of shoe I54 is a pressure element I55 engaged by one end of a spring I56 the opposite end of which is engaged by a follower I51 slidably mounted in the part I38 of lever I31.

Th hand grip part I39 of the operators control lever I31 comprises an inner part I58 connected to the hinge pin I40 and an outer grip part I59 secured to and carried by a screw I60 having screw-threaded connection with the inner part I58. The screw I60 is provided with an extension I6I the end of which engages the follower I'51. Turning the grip part I59 and screw I60 into the lever I31 will actuate the follower I51 to compress spring I56 and thereby actuate pressure element I55 against the friction'shoe I54 to in turn press said shoe against the arcuate surface I43 of the fixed element I 42 for holding the operators control lever in a desired operating position. Turning the grip part I59 of the operators control lever I31 in the opposite direction will release the force of spring I56 on shoe I54 and thereby the force of said shoe against element I 42 to permit manual movement of the operators control lever I31, as desired.

The starting valve portion 41 of the operators control device comprisesua casing mounted on the casing part 99 of said device at one side of the operators control lever I31; said casing having a through opening in which is slidably mounted a supply valve seat member I63. A cap I64 secured to the end of the casing opposite the operators control lever I31 has a sleeve I65 extending into the opening in the casing with its end engaging one end of the seat member I63. The opposite end of the seat member I63 is engaged by one end of a bushing I66 having a screw-threaded connection with the casing and extending from the opposite end thereof, and mounted over the extending portion of the bushing I66 is a cap I61 screwed onto the bushing into contact with the casing. Between the seat member I63 and the cap I64 is a supply valve chamber I68 open through one or more radial ports in the bushing I65 to an annular cavity I69 encircling said bushing and connected by a passage I10 to cavity I21 which is constantly supplied with fluid under pressure from the feed valve device I24, as abovedescribed. The seat member I63 is provided in chamber I68 with an annular seat rib I1I arranged for contact by a fluid pressure supply valve I12 for controlling communication between said chamber and a cavity I13 formed in the seat member I63 within said seat rib. 1 The cavity I13 is in turn open through one or more ports I 14 in the seat member I63 to a release valve chamber I15 formed at the opposite side of said seat member therebetween and the adjacent endof the bushing I66. The supply valve I12 is engaged on the side opposite the seat rib I1I by a spring follower I16 subject to the pressure of a spring I 11 contained in the sleeve portion I65 of .cap I64, said spring constantly urging said supply valve in the direction of its seat.

The bushing-I66 has adjacent the release valve chamber I15 an axial bore open at one'end to said chamber and at itsopposite end to a counterbore' I10, and slidably mounted in this axial bore and extending into the release valve chamber I15 is a hollow stem I19. The stem I19 has an annular collar I60 disposed in the counterbore I13, and projecting from said collar through 11 a suitable bore in the cap. I61 is an-operating stem I 8|. A fluid pressure release valve I82'of the disc type Contained in chamber. I is arranged to be engaged by the adjacent end of. the hollow stem "I19 for closing communication between said chamber and-atmosphere by way of one or more ports I83provided through saidvalvc outside of its seat on the end of said stem, thence through an axial bore I84 and one or more radial bores I85 in said stem to the counterbore I16 and thence past the loosely fitting collar I89 to a chamber I86 which is connected to atmosphere through one or more radial ports H31 in the cap I61. A spring I89 encircling the hollow stem I19 acts on the collar I89 thereof for urging said stem out of contact with the release valve I82 it being noted that the inner end of bushing I66 is disposed for contact by the release valve for limitingmovement thereof in the direction of said stem.

The supply valve seat member I63 is provided with an axial bore of smaller-diameter than cav ity I13 and slidably mounted in this bore is an operating pin I9I the opposite ends of which engage respectively the supply valve I12 and the release valve I82. Asuitable ring seal I92 carried by the supply valve seat member I63 and having sealing contact with the wal-lof the bore in the casing is provided for preventing leakage of fluid under pressure-from the supply valve chamber I68 to the release valvechamber I15, A similar rin'g I92c provided in the bushing I66 has sealing and sliding contact with the outer surface of the hollow stem I19 for preventing leakage of fluid under pressure from the release valve chamber I15 alongsaid stem to the counterbore I19 and thence to atmosphere. The release valve chamber I15 is open through one or more radial ports I93 to a passage I94 which is connected to a passage I95 in the braclget 34, for reasons to be Iate'rdescribed.

With the parts of the starting valve portion 41 in the position in which they are shown in the drawing it will be noted that the supply valve I12 "is closed to prevent-supply of fluid under pressure to the release valve chamber I15 and thence to passage I95 in the bracket 34 while the release valve-I92 is unsea'tedopeningchamber I15 and passage I95 to atmosphere. However upon movement of the operating stem I8I into the Gasing 'thehollow 5136111119 will first-move into eon-v tact with the fluid pressure release valve I82 to close communication between the release valve chamber I15 and atmosphere, following which, further movement oisaid stem acting. through said valve and the operating pinI'91I will open the fluid pressure supply valve I12. When the supply valve I12 is open fluid under pressure provided by the feed valve device I24 ini'the supply valve chamber I68 will-flow therefrom to the release; valve chamber I15 and thence to passage I96in the bracket 34. E Upon removal. of :force on the operating stem ISI "spring, I89 will return the hollow stem I19 to the position inwhich 'it'is shown in the drawing. As the stem I19 is thus moved, spring l11will move the supply valve I12, the operating pin I! and the release valve I82 with said stem until the supply Valve I12 seats to prevent further flow of fluid under pressure to the release valve chamber I15. After the supply valve seats the release valve I82 will contact shoulder I99 in the casing following which further movement of the hollow stem I19 by spring I 89 will open communication between the release valve chamber I15 andatmosphere for releasing 12 fluid under pressure from the passage I in the bracket.

A rockable bail I96 is provided for controlling or effecting inward movement of the operating stem I91 of the starting valve portion 41. One end of this ball is fulcrumed on the pin I65 extending through the shaft I355 carrying the operators control lever I31 and through the arm I34 projecting from the casing and in which said shaft is mounted, itbeing noted that said pin also secures said shaft to said arm, Near the opposite end of the bail I96 a button I99 is secured thereto for contact with the operating stem IBI and a spring I99 encircling said button is supported at one end on the starting valve portion 41 while its opposite end bears against said bail for urging the button I93 in the direction away from the operating stem I8I. The operators control lever I31 is provided with an operating element 299 on the hand grip portion I39 adapted upon movement of said hand grip portion about the hinge pin I99 in the direction of bail I96 to engage said bail and actuate same to push the operating stem I9I into the starting valve device 41. The ball I96 can thus be operated by the operators control lever I31 only in a certain portion of its operating zone, as will now be described.

Mounted over the operators control lever I31 and suitably secured, as by arms 29I and studs 292, to the casing part 99 is a cover 293 comprising a side portion 294 the outer end of which may be closed by cover 295 secured to said side portion. Through the side portion 299 there is pror vided a slot 296 through which the operators control lever I31 projects for confining movement of said lever to a chosen path and degree. The slot 296 comprises a relatively long portion 291 into one side of which opens a shorter portion 299. The longerportion 291 of the slot is arranged to permit movement of the operators control lever I31 about the'shaft I36 in a plane in which it is out of contact with bail I96 from a Stop position at one end of the longer portion of the slot to a Maximum Running Reverse Bounce Pressure position at the opposite end. The shorter portion 299 is arranged to permit movement of the hand grip portion of the operators control lever I31 about the hinge pin I49 for depressing the bail I96, and one end of this shorter portion 299 of the'slot 296 is aligned'with the end of the longer portion 291 adjacentthe- Stop position therein, it being noted that in this shorter portion the lever I 31 is also movable in the plane above mentioned, but to a lesser degree than in the longer portion 291 of the slot 296.

It is desirable that the operators control lever I31 enter the short portion 298 of the slot onlyat the end thereof adjacent the" top position of said lever. At the opposite end of the shorter portion 298 is a Start position and it is desirable that the lever be returned to the longer portion 291 of the slot only from this Start position. To insure this path of movement of the operators control lever I37 a ledge 2951 pro.- jectsfrom the side portion 294 of the cover into the. interior thereof for contact by the operating element 209, associated with the operators control lever, in the zone of movement between the Stop and Start positions above mentioned. The ledge 299 is provided adjacent one end with a=slot ZI9 adapted to permit movement of the element 29!] associated with the operatorscom trol lever from one side to theother .of the ledge to permit movement of saidlever from the Stop intothe short portion 268 of the slot to prevent return of said lever to the long portionof theslot until said lever ismoved to the star-t position where a slot 2I2. is providedthrough saidledge' to permit the ele'ment200 toreturn to the opposite side 'of said ledge in which the lever'willbeinthe long portion 201 of the slot. 3 r

When the operators control lever I31 is returned from the short portion 298 of the slot 293 into the' long portion ZD'I thereof itwill be in what may be called a Normal Running Reverse Bounce Pressure position and during runningof' the gas generator maybe adjusted from this position in a' direction away from the Sto'p position to any position ina Running 'Zone up to and including a Maximum Running'Re verse Bounce Pressure position, as required to regulate the frequency of operation of the gas generator', as will be later described While the gas generator I is operating under normal'conditions of motive gas consumption the operators control lever I31 will however occupy the Normal Running Reverse Bounce Pressure position.

It is desirable to prevent unintentional movement of the operators' lever I3! from the long portion 201 of the slot 206 back through the slot 2I2 to the Start position, and thisis prevented by the provision of a slidable trap 2I3 which is arranged to close the slot 2I2 immediately upon movement of said lever out of Start position to the Normal Running Reverse Bounce Pressure position and to then provide a substantially flush bridge across slot 2I2 for movement of the lever in the long portion 201 of slot 206 during running of the generator. The trap 2I3 has a 1ug'2l4 projecting therefrom in a direction away from the ledge 209 for engagement by the operating element 200 of the operators control lever I31 as it is moved to Start position through the short portion 208 of the slot 206 for moving'the trap out of closing relation with slot 2I2 by the time said lever obtains said Start position, whereby said lever may then be moved through the slot 2 I 2 to the long portion of the slot 206 when desired. When the element 200 passes through the slot 2I2 a spring 2I5 acting on the trap 2I3 promptly urges it to the position in which the slot 2 I2 is closed. It will thus be seen that the operators control lever I31 can onlybe moved to Start position in the short portion 208, of the slot 206 from the Stop position in the longer portion 201 and upon return to said longer portion from the Start position, unintentional return movement to the latter position through the slot 2 I 2 is positively prevented.

The feed valve device I24, above mentioned, may be of any conventional type operable to provide in pipe I fluid at a constant chosen reduced pressure, such as three hundredpounds, from a supply pipe 2I6, which may be charged with fluid at a pressure such as one thousand pounds.

The direct bounce supply valve device 35 is arranged to control supply of fluid under pressure from passage I26 in the bracket 34 to the feed valve device 36, the passage I25 being supplied with fluid under pressure from the feed valve device I24 by way of pipe I25.

The direct balance supply valve device 35 comprises a'casing removably mounted on'the bracket 34. andcontaining. a. flexible diaphragmpils clamped: around: its edge in the", casing and 00-. operating therewith to .form atone sideanonpressurexchamber 220 which isopen toatmojs: phereaas byway of a vent/passage 22I.

lower T224 contained in chamber 220 and engag ing. the'opposite side of the diaphragm,"and these: two followers are rigidly secured to oppositezsides. of the diaphragm by a. nut 225 provided on the stud223 andjengaging the.-fo1lower:224.-

The diaphragm follower 222 is provided in'the; face oppositethat: engaging the diaphragm with,

a recess in which is disposed asealing ring constitutin'g axvalve 2261=arranged to seal against an annular seat rib 22'! formed in the casing. .En-r circling the rib 227 is a pressure chamber 228 arranged ,on the side of diaphragm '2I9. opposite to the non-pressure chamber220 and open to atmosphere through a small'leak port 228a, and

within said rib is a pressure chamber 229 which is in permanent communication through a pas-'1 tends through a borein a partition wall 239 sepa-.

rating chamber 236- from chamber 229, and thence centrally through the latter chamber and.

an axial bore provided in the stud 223 an'd,.asso

ciated follower 222;. The stem 238 extends into;

chamber 228 above,-, the. stud ;223; and carries a;

ring; 240 for engaging the end of said stud where-j by deflection of the diaphragm 2I9 in the direction of the non-pressure chamber 220 willopen thesupply valve 235. 'One'end of a control spring 24I contained inchamber,220 engages the follower 224 while its opposite end is supportedon:

a follower 242 engaged by an adjusting screw 243 having screw-threaded engagement with the easing whereby the pressure of said spring-against the diaphragm 2 I9 may be regulated. The stem 238 carries a sealing ring 244 having sealing and slidingcontact withthe wall of the bore through partition 239 for preventing leakage of fluid under pressure between chambers 236 and 229.,

The timing valve device 232 associated with the gasgenerator I may be identical in construction ,to the starting valve device '41 associated with .the operator's control device 3, the pipe -23I from the direct bounce supply valve device 35 being connected'to the release valve chamber I15 therein, while. connected to the supply valve' chamber I68 is a pipe 233 which opensto pipe I4 connecting the reverse bounce chambers'l3 in said generator. The timing valve device 232 is so associated with the gas generator I that the supply valve I12 therein will be open and the release valve I82 closed when the direct bounce pistons I8 and ISdare disposed in the safety spaces 33 at the outer end of the reverse balance chambers), but when-said pistons are out of said chambers said supply valve will be closed and said release valve open. To thus control the timing valve device 232 means, such as a lug 234 may be provided on one of the racks, such as the rack; 22 for engaging and operating the operatingste'm I81 of said timing valve device at the-proper. time.-; i I 1 Engaging-':the opposite: side .of the diaphragm 2-I9 is-a foll'ower..222 .-having alstud 2235,extending'gcem, trally through the diaphragm and throughafol Theieed valve device. 36 may be identical in construction and operation to the feed valve device 124. Passage 231 connected to the feed valve device 36 constitutes a fluid pressure supply' passage to said device while the reference numeral 245 designates a delivery passage from said feed. valve device, said ieed valve device be! ing-operative upon supply of fluid under pressure to passage 231 to'deliver to passage 245 fluid at a constant reduced pressure, such as one hundred fifty pounds.

-The sequence valve device31 comprises a casing removably mounted on bracket 34 and containing'a flexible diaphragm 246 secured around its edge in the casing. At one side of the diaphragm is a chamber 241 open to atmosphere as by way of a passage 248, while engaging the opposite side of said diaphragm is a follower. 249. The follower 249 is provided with a stud 25.9 extending centrally through the diaphragm 246 into chamber 241 and mounted over said stud in the latter chamber is a diaphragm follower 251 and a nut 252 having screw-threaded engage.- ment with said stud and engaging the latter fol.- lower for securely clamping the central portion of the diaphragm between said followers.

.The casing of the sequence valve device 31 has a chamber 253 open to a passage 254 and containing a valve 255. The valve 255 is double ended, that is, in one position it is adapted to cooperate 'with a seat 256 in the casing for closing communication between chamber 253 and a passage 251 leading to atmosphere, while opening said chamberthrough an oppositely arranged valve seat 258 to a chamber 259, which latter v chamber is open to passage I95 in the bracket 34. i

In another position of valve 255 it is arranged to cooperate with seat 258 for closing communication between chambers 253 and 259 and for opening the former chamber to the exhaust passage 2 51.

The' valve 255 is voperatively connected to a stem :269 which extends through the communicationencircled by valve seat 258 between chambers 253 and 259; and thence through the latter chamber, a partition wall 25I and an axial bore provided through the fo1lower'2'49 and stud 259. A ring 262 carried by the stem 269 engages the outer face of the diaphragm follower 249 while a similar -ring2 63 secured 'to said stem engages'the'opposite end of stud 259 for connecting said stem to the diaphragm 246 for movement thereby. A sealing ring .2 64 provided in the stem 269 within the axial vbore through stud 259 has sealing fcontact with the wall of said bore to prevent leakage of fluid under pressure along said stem to .the i ion-pressure ,charnber 241. A similarsealihg ring 265 carried by the vstem 2.6.9 engages the wall of "bore through partition wall 25] for preventing leak-age of. fluid underpressure betweenchamber .259 'at one side .of said Wall and a pressurechamloer 266 at theiopposite side. Chamber 2665s provided within .a sealing rib 261 encircling "the stem 259 concentrically thereof and arranged for contact by a valve'2'68' provided in theadjacent .face of diaphragm follower .249. Encircling the .seat rib26-1 is :a pressure chamber 269 which 'is open tov atmosphere one end against the :diaphragmflclamping 'nut' 252 while its opposite endis supported onza-seat 2l1 in turn supported on one end of 'anaadjnst ing screw2 I 8 having screw-threaded engagement with the casing, i I The vent valve device 38 comprises a casin containing a. piston 212 at one side of whichis a non-pressure chamber 213 open to atmosphere through a vent port 214. At the opposite side of piston 212 is a pressure chamber 215 open to passage 95 in the bracket. The piston 212.115 provided with an operating stem 21.6extending through chamber 215 and a suitable bore in a partitionwall 211 separating said chamber. from a chamber 218 and'thenc'e through a communi:

cation 219 into a chamber 289 which is open to .212 againstspring 294 to permit closing of valve 282 by sprin 283.

Th dump pp y valve device 39 comprises a casing removably mounted on bracket 34 and having a chamber 285 open to a passage 286 and containing a valve 291 arranged to cooperate with a seat 28a for controlling communication between said passage and a passage 289. which is connected by a pipe 239 to pipe 39 leading to the piston chambers 28 in the several starting valve devices 24. The valve 28 1'is connected to a plunger 29! which is slidably mounted in a par o wa l .9. separ t ch mber 285 at one side of said :wall from a chamber 2:93 :at the opposite side. Chamber 29.3.18 open to atmosphere through a vent port 2955. A sealing n arr y the l n r :9! has sealing and s i ment with t l o the bore partition wall 2-92 for preventing lealge age of fluid under pressure from chamberg-285 to chamber 29:3. The diameter of plunger 291 is substantially the same v.asthat of seat 288 so that with valve 281 engaging said seat and chamber 285 charged with fiuid under pressure, in a manner .to be later described, the opposing forces developed by said pressure on said'valv'e and plunger will be substantially equal. The plunger .29.! ,is connected ,to one .end of a stem 2.96 the opposite .end of which is connected to a piston 291 one side of which is open to chamber 293. At the opposite side ,of piston 291 is a pressure chamberpZBB open to passage 254. A spring 299 contained in chamber 291. acts on piston 2 9 .1 for urging same in .a direction to unseat valve 291 from its seat 238. A dash pot piston 291a associated with piston 291 is cooperative with the casing to control movement of-piston291 by spring 299.

The dump exhaust valve device 49 comprises a casing removably mounted on the bracket '34 and containing a flexible diaphragm '39! clamped around its edge in the casing. At one side of the diaphragm 39l is a pressure chamber 392 opened to a passage 393 in the bracket, while at the opposite side is a non-pressure chamber 3953 opened to atmosphere through a slot 395. A follower *396 contained in chamber 392 and engaging the adjacent face of diaphragm =39} isprovided with a stud 39-1 extending centrally through the diaphragm and through a follower 998 engaging the opposite side of the diaphragm and has screw-threaded engagement with a combined nut and spring seat 309 which is ar-' ranged to clamp the two followers to opposite sides of the diaphragm. I I

The casing of the dump exhaust valve device 40 is provided with a bore arranged in coaxial relation to diaphragm I and opening atone end to the non-pressure chamber 304 and at the opposite end to a chamber 3l0 which is connected to passage 289 in the bracket, and slidably mounted in this bore is a plunger 3| I. The plunger 3 is provided on one end of a stem 3| 2 which extends through an axial bore in stud 301 into the pressure chamber 302 wherein a button 3| 3 is provided on'the end of said stem for contact by the diaphragm follower 306. A valve 3 contained in chamber 3l0 is loosely connected to the plunger 3 and is arranged to cooperate with a seat 3!! for controlling communication between chamber 3l0 and a passage 3|6 in the bracket 34 which passage leads to atmosphere. The diameter of the valve seat 315 is substantially the same as that of plunger 3 whereby with the valve seated and chamber 3!!) charged with fluid under pressure, ina manner which will be later described, the force acting in a direction to seat said valve will be substantially counterbalanced by the force acting to move the plunger 3| l in a direction away from said valve whereby a minimum of force will be required on the stem 3 I Z'for opening the valve The end of the casing at the upper end 3|4. of the bore in which plunger 3 is mounted provides a stop 3l1 for engagement by the nut 309 to limit movement of the diaphragm 31 in a downwardly direction, the parts being so arranged that a certain amountof this movement will occur after seating of'thevalve 314 and thus relative thereto. A sealing ring3l8 carried by plunger stem 3l2 and having. sealing and sliding contact with the wall of the bore through stud 301 is provided for preventing leakage of fluid under pressure from chamber 302 to the non-pressure chamber 304. A smiliar sealing ring 318a carried by plunger 3 has sealing and sliding contact with thewall of the bore in which said plunger operates for preventing leakage of fluid under pressure from chamber 3) to chamber 304. A regulating spring 3|0 supported at one end on an adjustable seat 320 having screw-threaded engagement with the casing bears at its opposite end against the combined nut and spring seat 309 for opposing movement of diaphragm 301 by pressure of fluid in chamber 302. Encircling the plunger stem 3l2 and interposed between the plunger 3| l and the combined nut and spring seat 309 is a light bias spring 32l for permitting movement of diaphragm 30| relative to valve 3|4 as before mentioned and for also permitting movement of said valve relative to said diaphragm as will hereinafter be brought out.

The specific structure of the dump valve.device 40 is the invention of Donald J. Priceand is fully described and claimed in his copending application Serial No. 766,973, filed August 7, 1947, and assigned to the assignee of thepresent application. v j

The shuttle or selector valve device 325 comprises a casing removably mounted on the bracket 34 and having a chamber 326 open to a pipe 321 leading to pipe 20 which connects together the two reverse bounce chambers l9 in the gasgenerator I. Contained in chamber 326 is a double seating valve 328 arranged in one position to cooperate with a seat 329 for closing communication between pipe 321 and a pipe 330 leading reasons to be hereinafter described. I

to the direct bounce governor 4, and for at the same time opening communication between pipe 321 and passage 303 in the bracket 34 through a seat 33!. In another position, valve 328 is adapted to cooperate with seat 33l for closing communication between chamber 326 and the bracket passage 303 and for opening communication through the valve seat 329 to pipe 330 leading to the direct bounce governor 4. The valve 328 is loosely connected to one end of a stem 332 which extends through the seat 33l and a partitionwall 333 into a chamber 334 which may be open to atmosphere by way of a vent port 335. The partition wall 333 separates the atmospheric chamber 334 from-the communication with passage 303. A sealing ring 336 carried by the stem 332 has sealing and sliding contact with the wall of the bore through partition wall 333 for preventing leakage of fluid under pressure from passage 303 to the atmospheric chamber 334. Chamber 334 is provided at one side of a piston 331 to which the stem 332 is connected. At the opposite side of piston 331 is a pressure chamber 338 which is open to passage I95. A spring 333 contained in chamber 334 acts on the piston 331 for actuating same, when chamber 338 is open to atmosphere, as will be later described, and thereby the stem 332 to move the valve 328 into contact with seat 33l. A dash pot piston 331a associated with piston 331 is cooperative with the casing to prevent spring 333 slamming valve 328' against seat 33l with damaging force.

The check valve 4| i provided for preventing flow of fluid under pressure in a direction from passage 303 to a passage 340 and is subject to light pressure of a bias spring 3 which urges it toward its closed position. The check valve 42 is provided for preventing flow of fluid under pressure in the direction from passage 286 to passage 245 and to limit pressure of fluid obtained in passage 2B6 irom passage 245 to a chosen lower degree than in the latter passage, as will be later described. To. accomplishthese lends the check valve 42 is subject to pressure of a spring 342 .for urging it to its closed position with a chosen degree of force. The check valve 43 is provided for preventing new of fluid under pressure in the direction from-passage 210 to passage 303 and subject to the light seating pressure of a spring 343. It willbe noted that the sequence volume 45 is always open to passage 210 inthebracket. I

The choke 44 is adjustable to provide a restricted opening between passages 245 and, 340 for providing a desired rate of flow of fluid under pressure in the direction of the latter passage, for

A communication may be provided between pipe 23l from the timing valve device 232 and passage 254 in the bracket 34 by way of a check valve 348 contained in said bracket and arranged to prevent flow of fluidgunder pressure in the direction to said pipe. A spring 349 acts on said check valve 348 for urging-it to its closed position.

Thepick-ofi valve device 53 to which pipe 52, connectedto the operator's control valve device 3, is connected comprises .(Fig. '8) .a casing which may be mounted on pipe I4 .connectingfthe reverse bouncechambers l3 in thegenerator'l' and preferably close to one ofsaid chambers. The

casing has a communication between'ipipe l4 and pipe 52 for permitting flowof'fluidfiunder pressure in. the direction from the reverse bounce chambers l3 to the latter pipe, a check valve 344 being provided for closing this. communication is to prevent reverse fiow of fluid under pressure therethrough. A bias spring 345 acts on the check valve 344 for urging it to its closed position. By-passing the check valve 344 is another communication controlled by an adjustable choke valve 346 through'which fluid may flow at a restricted rate from pipe 52 to pipe M. The casing also has a restricted vent passage 341-opening pipe 52 to atmosphere.

The direct bounce governor device 4 comprises a fluid pressure regulating mechanism 359 for controlling the pressure of fluid in the direct bounce chambers 19' of the gas generator I and a control portion 35l for controlling operation of said regulating mechanismQsaid mechanism and control portion comprising a common casing section 352 mounted on a pipe bracket 353 and the said mechanism comprising in addition a casing section 334a mounted on the casing section 352.

The fluid pressure regulating mechanism 358 comprises a supply valve 355 contained in a chamber 356 and arranged to cooperate with a seat 351 for controlling flow of fluid under pressure from chamber 356 to an outlet chamber 356 provided in bracket 353. A guide member 359 projecting above the seat 351 is providedwith a tapered openingfor receiving the valve 355 to guide it to its seat and to also cooperate with said valve when in saidop ening to throttle flow of fluid under pressure from chamber 356 to the outlet chamber 358. The chamber 356 is open directly through pipe 354 and a cut-out valve 369 to the mainfluid pressure supply pipe 216 and in operation is therefore adapted to be constantly supplied with-fluid under pressure from the latter pipe. The outlet chamber 358 is open to'pipe 336' and during running of the generator 1 is adapted to be connected through the shuttle valve device 325 to pipe 321' leading to the direct bounce chambers I9 in saidgenerator.

The supply valve 355 is connected to the end of a'stem'36l by a pin 362, said stemprojecting from a controlpiston 363 operatively mounted in a-bushing 364 held in position between the casing sections 352 and- 354a. An equalizing-port 365 through the bushing 364 is provided to permit equalization of fluid pressure from chamber-"356 into a chamber 366 at the stem sideof the piston 363. At the opposite side'of the'piston 363 is a' control chamber 361 open through a choke 368, a strainer 369 and a passage 369a in the piston stem 36I to chamber 356. A spring follower 356a mounted on the stem 36! in contact with 'valve 355 is engaged by one end of a-precompressed spring 3680, the other end of which is supported by the bushing 364, said spring beingprovided for closing said valve upon substantial equalization of pressure of fluid acting on opposite sides of piston 363.

Disposed in the casing section'354a is a valve seat member 319 held in place by a' retainer 31i secured in said casing-section. The seat member 319 has a boreopen at one end to a passage 312 leading tothe outlet chamber 358 and to the control portion 351 of the direct bounce governor device. The'opposite end of this bore opens througha valveseat 313to a chamber 314 which in turn-is connected. through one or more ports 315 inretaine'r- 311 to the control chamber 361 at the one face of piston'363. Slidably mounted in a bore in the retainer31| coaxially 'ofthe :valve seat 313, is .a valve 316 arranged tocooper- ,ate with seat 313 for closing communication between chamber 3141and passage 312. A plunger 311 slidably mounted in a bore in a partition wall 318 has-an extension 319 of smaller diameter than the axial bore in seat member 316 and extending therethrough for contact'with the valve 316 for unseating it against a spring 38%) carried by'said'seat member. The plunger 311 isprovided on its opposite end with a projection 382 extending into a chamber 38] for cooperation with a valve 383 which is slidably mounted in a bore 384 arranged in coaxial relation to said plunger 311 in an element 385' secured in the casing. The valve 363 may be provided with slots 386 around its edge to provide communication between opposite sides thereof. The chamber 38| is open through a port 381 topassage 312 and thereby to the outlet chamber 358.

A cover 388 is clamped to the end of the casing section 3540!. opposite that engaging the easing portion 352, and clamped between said cover and the casing section 354a is a flexible diaphragm 389' arranged in coaxial relation with the bore 394 in the element 385. At one side of this diaphragm is a control chamber 399 in which the element 385 is disposed. At the opposite side of the diaphragm is another control chamber'39l. The chamber 399 is open through a passage 392 and a pipe 393 directly to one'of the direct bounce chambers [9 in the gas generator I, a chosen restriction to flow of air through this communication being provided as by said pipe being of relatively small flow capacity. The chamber 39! is open through a choke 394 and a passage 395 directly to the fluid pressure supplypipe 354.

A diaphragm follower 396. disposed in chamber 399 engages the adjacent face of diaphragm 389 and has aportion 391 extending through a central opening in saiddiaphragm and a follower 398 disposed in chamber 39! against the opposite side of the diaphragm, and these followers are rigidly clamped to opposite sides of saiddiaphragm by a securing element 399 engaging the follower 398 and having internal screw-threaded engagement with the portion 391 of the follower 396. I

The diaphragm follower 396 has an integral member 499 disposed in the bore 384 in the element 385, said member 499 having a spherical like surface in sliding contact with the wall of saidbore and carrying a sealing ring 49.! having sealing contact with said wall. On the inner-.

most end of the integral member 409 is formed a ,valvet seat 492 arranged for sealing engagement with the valve 383. A shoulder 483 substantially encircling the valve seat 492 and projecting from the wall of bore 384 is provided for contact by valve 386 for unseating said valve from the member 498 upon movement of said member in the direction away from said valve.

The valve seat 492 encircles a fluid pressure release passage 494 extending through theinte- -gral member 499 and the follower 396 to a chamber 495 provided at the opposite side of the diaphragm 389 in a coaxially arranged cylindrical portion 496 of the. securing element 399. Slidably mounted in the cylindrical portion 496 is one end of a rigid strut 491 the opposite end of 'which is slidably mounted in a bore in the cas- 409 in the'casing cover 388 which passage opens toatmosphere.

The opposite end portions of the strut 491. in contact with the wall of the bore in the casing cover 388 and with the wall of the cylindrical portion 496 are rounded to permit free slight misalignments or wobbling of the diaphragm 389 during movement thereof, which will be later described, and in each end of said strut is a sealing ring 4!!] having sealing and sliding contact with the respective wall for preventing leakage of fluid under pressure from the control chamber 39! to the atmospheric passage 499. V

The diameter of the rigid strut 49'! at its point of contact with the cylindrical portion 496 of the securing element 399 is greater than the diameter of the integral member 400 at the opposite side of the diaphragm which is disposed in the bore 384, whereby less area of the diaphragm 389 is subject to pressure of fluid in chamber 39! than is subject toopposing pressure of fluid in chamber 390, in order that a lower pressure of fluid in the latter chamber will provide a force to balance a higher pressure of fluid in the former chamber during operation, to be hereinafter described. 4 I

v The control portion 35! of the direct bounce cylinder comprises a flexible diaphragm 4!! secured around its edge between the casing section 35! and the cover 4! 2. Between the cover 4! 2 and the diaphragm 4!! is a control chamber 4!3 open through a passage 4M and a pipe 4 5 to the scavenger air receiver 9. At the opposite side of diaphragm 4! is a chamber 4 !6 which is open to atmosphere through a vent port 4H.

A follower 4!8 disposed in chamber 4 !6 against the adjacent face of diaphragm 4!! has a stud portion 4l9 extending centrally through the diaphragm into chamber 3 and over this stud portion in the latter chamber is mounted a follower plate 426 against the diaphragm and a nut 42! having screw-threaded engagement with said stud portion for clamping the central portion of the diaphragm between the follower M8 and plate 420. A regulating spring 422 contained in chamber M6 and supported at one end on the casing section 352 bears against the diaphragm follower 4!8 urging the diaphragm MI in the direction of cover 4!2.'

The casing section 352 has a bore'arranged in coaxial relation with the diaphragm'Ml and containing a plunger 423. The plunger 423 is provided on the end adjacent the diaphragm 4!! with a stem 424 extending through a chamber 425 and an axial bore in a bushing 426 secured in the casing section 352, into chamber M6 and thence through said chamber into contact with the diaphragm follower 4! 8. Adjacent to the follower 4'l8 washer 42'! is secured to plunger stem 424 by a ring 428 secured to said stem and interposed between one side of this washer and a shoulder in the casing section 352 is a' bias spring 429 for maintaining the stem 424 in con- .stant contact with the diaphragm follower M8.

said bushing to the atmospheric chamber 4! 6.

Another sealing ring 43! carried by bushing 426 has sealing and sliding contact with the stem 424 to prevent leakage of fluid under pressure from chamber 425 along said stem to atmospheric chamber M6.

The plunger 423 has a bore 432 closed at the 22- end adjacent stem 424 and opening at the opposite end to one end of a supply valve chamber 433 the other end of which is closed by plug 434 secured by a ring 435 in the end of said plunger opposite the end fromwhich projects the, stem 424. The plug 434 is provided in valve chamber 433 with an annular valve seat 436 arranged for sealing contact by a disc valve 43! containedin said chamber. A spring 438 extending through the bore 432 and chamber 433 acts 'on the valve 43! for urging it toward seat 436.

The end of the portion of plunger 423' containing the plug 434 is disposed in a chamber 439 and said chamber and chamber425 at'theopposite end of the plunger are both connected to passage 312 from the outlet chamber 358. Midway between its ends the, plunger423 is provided withan annular cavity 440 formed in its outer surface and open by way of a passage 44! to the diaphragm chamber 39! in the fluid pressure regulating mechanism 359. The plunger 423 is further provided with one or more ports 442 opening the annular cavity 449 to bore 432 within said plunger. plunger v423 is providedwith an annularsealing ring 443 having sealing andsliding contact with the wall of the bore in the casing section in which said plunger is mounted forpreventing leakage of fluid under pressure between said cavity and chambers 425 and 439 at opposite ends. of the plunger. A similar ring 443a carried by the plug 434 and engaging the wall of the bore in plunger 423 in' which said plug is disposed is provided to prevent leakage of fluid under pressure from chamber 433 tochamber 439.

The valve seat 436 encircles an axial bore 444a extending through the plug 434 and opening to chamber 439, and freely extending through said chamber and bore into contact with the valve 43! is one end of a plunger 444 which is carried by a housing 445 secured to the casing section 352'. The plunger 444 comprises an enlarged central portion 446 slidably mounted in a suitable bore in the housing 445. Extending from one end of the central portion 446 through a chamber 441 in said housing and thence through a partition wall 448a separating said chamber from chamber 439 is a portion 448 of reduced section from the end of which projects a portion 449 which engages the valve 431, the portion 449 being of smaller diameter than that of bore 444a through plug 434 to provide for flow of-fluid under pressure through said'bore. The chamber 441is open to atmosphere as by way of a vent port 449; Projecting from the opposite end of the central portion 446 of the plunger is a portion 450 of smaller cross-sectional area than the central portion. The portion 45!! is slidably mounted in a suitable bore provided in a plug 45! secured in the housing 445 by a ring 452,and extends beyond the outer end of the plug 45! and of the housing 445. At theinner end of plug 45! is a chamber 453 encircling the portion 459 of'plunger 444 and connected by a passage 454 to the annular cavity 440 and thence by way of passage 44! to diaphragm chamber 39! in the fluid pressure regulating mechanism 356.

A sealing ring 455 carried by the plug 45! has sealing contact with the encircling housing 445 for preventing leakage of fluid, under pressure from chamber 453 past said plug to atmosphere. Another sealing ring 456 carried by plug 45! has sealing and sliding contact with the portion 450 of the plunger 444 for preventing leakage of fluid under pressure from chamber 453 along said portion of the plunger to atmosphere. A sealing At either side ofvcavity 440 the valve devices 24 will therefore be maintaining the vent valves 25 closed.

With pipe 23! open to atmosphere as above described, the connected chamber 229 in the direct bounce supply valve device 35 will also be open to atmosphere and permit spring 24'I therein to seat the valve 235, and also the valve 226 against the rib 221.

Let it further be assumed that the pressure in the scavenger air receiver 9 is substantially that of atmosphere, as a result of which, a corresponding pressure will be effective through pipe M in diaphragm chamber 4I3 of the control portion 35I of the direct bounce governor device 4 which will permit the regulating spring 422 and the bias spring 429 therein to hold the parts of the control portion 35I in the position in which they are shown in the drawing.

Now let it be assumed that pipe 2I6 is connected to a source of fluid at a desired pressure, such as one thousand pounds. Fluid thus supplied to pipe 2 I 6 will flow to the feed valve device I24 and also through the normally open cut-out valve 366 and pipe 354 to the direct bounce governor device 4. The feed valve device I24 will then operate to provide in pipe I25 fluid at the desired reduced pressure, such as three hundred pounds, which will flow through said pipe to passage I26 in the pipe bracket 34 and also to the feed valve device 459. Fluid thus supplied to passage I26 in the bracket 34 will flow to the annular cavity I21 encircling the bushing IIJI in the operators control device and thence through port I28 therein to chamber I29 encircling the plunger I04 and thence through ports I29a in said plunger to the supply valve chamber III.- Fluid supplied to passage I26 in the bracket 34 will also flow to the supply valve chamber 236 in the direct bounce supply valve device 35, the supply valve 235 being seated at this time. The cut-out valve device 46I being normally closed, the feed valve device 459 will merely operate to charge pipe 460 from pipe I25 to a pressure, such as one hundred ten pounds, determined by the adjustment of said feed valve device. I

When fluid under pressure is supplied-through pipes U6 and 354 to the direct bounce governor device 4, as above mentioned, it will'flow into the supply valve chamber 356 therein and also through passage 395 and choke 394 into' diaphragm chamber 39I and from the latter chamher through passage I and ports' 442 in the plunger 423 to the valve chamber 433r in said plunger. 7

Now assuming that the piston assemblies of the gas generator are initially in some position other than their innermost positions, the valve 43 1.will be seated with diaphragm M I and plunger 423 in the position in which they are shown in thedrawing and which position will be assumed when the pressure in diaphragm chamber 4 I 3 and in the scavenger receiver 9 is substantially that of atmosphere, as before mentioned. As a result, pressure in diaphragm chamber 39I of the fluid pressure regulating mechanism 350 will gradually increase through choke 394 and provide a force on'diaphragm 389 which will move samein the direction of chamber 396 for thereby actuating the integral, member 490 into seating engagement with the valve 383 and for then shifting said valve against plunger 311 to unseat the valve 316 Upon vunseating of valve 316 thechamber 3.61 at one side of the control piston 363 willbeopened past said valve to passage 312 and thence tfofthe outlet chamber 358 which at this time is open through the shuttle valve device 325 to pipe321 leading to the direct bounce chambers I9. The pressure in the supply piston chamber 361 will thereby be reduced sufficiently below the supply pressure in chamber 366 to provide a force on the piston 363 to move same in a direction to pull the supply valve 355 away from the seat 351, whereupon fluid under pressure from the supply valve chamber 356 will flow to the outlet chamber 358 and thence through pipe 330, the shuttle valve device 325 and pipe 321 to the direct bounce chambers I9, by way of chambers 32 and ports 3I in the gas generator I. As pressure of fluid in the direct bounce chambers I9 is thus increased, such pressure acting on the direct bounce pistons I8, I 8a will move said pistons'in the directionof their innermost dead points, since "the reverse bounce chambers I3 are, at this time, open to atmosphere through the operators control valve device 3 in Stop position, as above de; scribed.

As fluid under pressure is thus supplied to the direct bounce chambers I9 it will equalize through pipe 393 back into diaphragm chamber 396 in the direct bounce governor device 4 and thereby provide a force on diaphragm 389 proportional to the increase in pressure in the direct bounce chambers I9 and opposing pressure of fluid in chamber 39I. As the piston assemblies of the gas generator I are moved into their innermost dead positions, the rack 22 associated with the air compressor piston I 2a will operate plunger 444 to unseat the valve 431 and thereby establish a communication between diaphragm chamber 39I and passage 312 which is open to the outlet chamber .358 and thereby to the direct'bounce chambers I9. The venting capacity of valve 431, when opened by rack 22 as just described, so exceeds the flow capacity of choke 394 to supply fluid to diaphragm chamber 39I, thatthe pressure in said chamber will then promptly reduce into the direct bounce chambers I9 to a sufliciently low degree to permit pressure of fluid in the direct bounce chambers I9 and diaphragm chamber 390 plus pressure of spring 386 to deflect the diaphragm 389 against the reduced pressure of fluid in chamber 39I to permit closing of valve 316 by said spring.

When the valve 316 in the direct bounce governor device 4, is closed asjust described, fluid at the supply pressure in chambers 366, 356 at one side of piston 363 will promptly equalize through the passage 369a and choke 368 into piston chamber 361 whereupon spring 368a will actuate said piston to close the valve 355 for preventing further flow of fluid under pressure to the outlet chamber 358 and thereby to the direct bounce chambers I9- in the gas generator I. With valve 431 still open the pressure of fluid in diaphragm chamber 390 will then substane tially equalize with that in chamber 39I and since a greater area of diaphragm 389 is exposed to pressure of fluid inchamber 390 than is exposed in chamber 39I, a force will beprovided on said diaphragm which will actuate same to. move member 469 out of engagement with valve 383 to thereby open chamber 38I to atmosphere through passage 404 in the'diaphragm follower 396, and thence through bore .498 in the .rigid strut member 491. When chamber38I'is thus opened to atmosphere the fluid under pressure flowing to passage 312 past theopen valve 431 in the control portion 35 I will be vented to atmos phere, and along with it the fluid under pressure, from the direct bounce chambers I 9. As the fluid under pressure isthus released from the direct bounce chambers I9 thepressure in diaphragm chamber 39.0'will correspondingly reduce, but under: the condition being describcdthc ventin capacity of the open valve 431 is so in excess-of the new. capacity of choke 3.94120. supply'fluid to diaphragm chamber 38.! thatthe pressure. said chamber 39! will be reduced substantially with the reduction in pressure in chamber 3Erl1and in the direct bounce chambers 19,: so that upon completerelease of fluid under pressure from the direct bounce chambers l9 and from the connected chamber 399 at the opposite side of diaphragm 38.9, the pressurein diaphragm chamber 39! will be substantially that of the. atmosphere so that said diaphragm will remain in the position in which the valve 383' is open.

If, at the time fluid under pressure is initially supplied to the direct bounce governor device 4, as just described, the piston assemblies of the generator happen to be in their innermost positions opening the valve 431 in the control portion 355 of the direct bounce governor device 4, the fluid under pressure supplied through choke 394 into diaphragm chamber 39| will merely equalize past valve 431 into passage 312 and be dissipated to atmosphere past the valve 383, if open. In case the valve 383 is closed at this time, the fluid flowing to passage 312 will equalize through the outlet chamber 358 into the direct bounce chambers IQ of the generatorand from thence through pipe 393 into diaphragm chamber 390 and will build up therein substantially with the increase in pressure of fluid in chamber 391. When a sufficient increase in pressure is thus obtained in chamber 390 to overcome the pressure in chamber 39! acting on the smaller exposed area of diaphragm 389, said diaphragm will operate to open thevalve 383 and dissipate the pressure from both of said chambers, as well as from the direct bounce chambers [9 in the generator, and said diaphragm will then remain in the position in which valve 383 is open. v It will now be briefly noted that when the control lever i3! is moved to Stopfposition, and fluid from the supply pipe 216 willbe connected to the direct bounce governor device 4, the piston assemblies of the gas generator l will move to their innermost dead points, if not already 30 positioned, under pressure of fluid supplied to the direct bounce chambers 13 by operation ofsaid governor device, following which said governor r device will operate to open said chambers to atmosphere for releasing fluid under pressure therefrom without any change in position of said piston assemblies occurring.

In the above description it was assumed that the scavenger air receiver 9 and hence the diaphragm chamber 4.!3 in the control portion 35! of the direct bounce. governor device 4 were at atmospheric pressure under which condition the inner dead points or positions of the piston assemblies would be the most inward positions which said assemblies could ever assume; It is desired to point out, however, that the inner dead points of the piston assemblies at which the valve 4 3'! is opened to cause venting of fluid under pressure from the direct bounce chambers H! of the generator and from chamber sec in the direct bounce'governordevice 4, as above described, will varyin accordance with the pressure of fluid in the scavenger receiver 9 and hence inaccordance. with that in diaphragmchamber H3 and the position of diaphragm 4H and of the valve seat 436 in plunger 423. Therefore, ifthe scavenger receiver 9 is charged with fluid under pressure. when the operators control lever .131 .is' moved spring 68 will be relative to said Plunger.

28,. to the Stop position the valve 437 will be opened at the inner dead points of the piston'assem blies as determined by the pressure oi fluid in the scavenger receiver 8, but in the initial charg ing of the apparatus, as above considered, dia phragm 389- in the governor device 4 will move to and then remain in the, position for venting the direct bounce chambers 19, in the same manner as above described.

Normal starting of gas generator 1 Whenthe temperature of the gas generator I is such that the piston assemblies therein will move without undue sluggishness, due for instance to congealed lubrication, said generator may be startedras follows. 7

The operators control lever :37 will be moved from Stop position through the slot 2 ID in" the ledge 2,09 and thence to the Start position, at the opposite end of the short portion 208 oi-ithe slot 206. This movement of the operators control lever I31 will actuate the cam Hi6 and follower 151 to displace, as a unit, the plunger tilt, the seated supply valve H3, the seated supply pilot valve H1, the pin I20 and theplunger Tl'against the release pilot valve 83 and move said release pilot valve against spring 9| until it becomes seated. When the release pilot valve 83 becomes seated as just described it will hold the plunger H and thereby the pin I20 against further move ment whereupon continued movement of the plunger H34 in the direction of these parts will cause. said pin to firstunseat the supply pilot valve I I! and then the supply valve l 13, whereupon fluid under pressure from the supply valve chamber l l I will flow past said supply valves to chamber 63 and thence through passage 64 and pipes 65 and Hi to the reverse bounce chambers I3 in the gas generator i; Fluid from chamber 63 will also flow by way of passages 64 and 98 to the balancing piston chamber to act on the piston "9-3 to counterbalance the same pressure acting in chamber 63 on the cylinder H3.

- 'As fluid under pressure i supplied to thereverse bounce chambers l3, as just described, fluid at the same pressure will also flow through the pick-oil valve device 53, by way of the check valve 344 therein, and thence through pipe 52' to diaphragm chamber 5| in the operators control device 3; As the pressure of fluid in chamber 5| then increases it will deflect diaphragm 48 against the regulating'spring 68. With the operators control lever 13! in the Start" position displacement of the plunger I04 will be limited, so that deflection of diaphragm 48 against the regulating The seated release pilot valve 83' and plunger 11 and thereby pin I20 will move with the diaphragm l8 due to the pressure of spring I I9 thereon and thus permit movement of the supply valve H3 and supply pilot valve I I! in the direction of the seat for said supply valve also under the action of said spring. When sufficient pressure is thus ob tained in diaphragmchamber 5|, corresponding to the position of the operators control'lever I31 in. "Start position, the diaphragm 48 will as: sume a position in which both the supply valve [[3 and supply pilot valve II! will be seatedito thereby preventfurther flow of fluid under pressure to chamber 53 in'the. operators control device and to the reverse bounce chambers l3'in thcjgas generator. Lj Itwill thusbe seen that wheu theoperators control lever I3! is moved to Start. positionthe reverse b'ouncechambers l3 in th gas generator, 1' will become charged with fluid at a pressure, such as twenty pounds, corresponding to the position of said lever. In the gas generator I this pressure in the reverse bounce chambers I3 will move the piston assemblies apart to their outermost positions in which thedirect bounce pistons I8, I80; will be disposed in contact with the end walls of the-safety spaces 33 at the outer end of the direct bounce chambers I 9. The direct bounce chambers I9, 32 will at this time be open to atmosphere through the direct bounce governor device 4, as described under Initial Conditioning and Charging. The movement of the operators control lever I31 into the short portion 283 of the slot 286 and thence to Start position therein will also cause closing of the release valve I82 and opening of the supply valve I12 in the starting valve portion 4! of the operator control device. Thereupon fluid under pressure supplied by the feed valve device I24 through pipe I25 and passages I26 and I18 to the supply valve chamber I88 in the starting valve portion 41 will flow past the supply valve I72 to the release valve chamber I15 and thence to passage I95 in the bracket 34, it being noted that this supply of fluid to passage I 95 will occur at the same time as fluid under pressure is being supplied to the reverse bounce piston chambers I3 in the gas generator I.

Fluid under pressurethus supplied to passage I 95 will flow to piston chamber 338 in the shuttle valve device 325 and therein act on piston 331 to move it against spring 339to unseat the valve 328 from its seat 33I and to move it intoengagement with its opposite seat 329 so as to disconnect pipe32I, leading to the direct bounce chambers I9 in the gas generator I, from pipe 338 connected to the direct bounce governor device 4 and to open said pipe 321 to passage 383 in the bracket 34.

Fluid under pressure supplied to passage I95 will also flow to chamber 215 in the vent valve device 38 to act on piston 212 to urge it against spring 284 for permitting closing of valve 282- by spring 253. Fluid from passage [95 will alsoflow to chamber 259 in the sequence valve device 31.

As before describedthe valve 255 in the sequence valve device will at this time be seated on its lower.

gas generator I are moved into the safety spaces 33 by pressure of fluid provided in the reverse bounce chambers I3, as above described, the timing-valve device 232 will be operated thereby, as through the medium of lug 234 on'rack 22, to establish communication between pipe 233, connected to pipe I4 connecting together the reverse bounce chambers I3, and pipe 23I, jwhereupon fluid under pressure supplied by the operators control device in Start position to pipe I4 will also flow to pipe 23I and thence to chamber 229 in the direct bounce supply valve device '35..

When sufiicient pressure is thus obtained in chamber 229 to overcome the opposing pressure of spring 24I said pressure will unseat the valve 226 from the seat rib 22I,'whereupon fluid pre ssure from pipe 23I will also becomeeiiective in chamber 228'thereby exposing the full effective area of diaphragm 2I9 to pressure of fluid from said pipe. The increased fluid force thereby prO-' vided on diaphragm 2I9 will promptly overcomethat of spring MI and move said diaphragm against said spring to actuate stem 238 to unseat the supply valve 235. Fluid under pressure supplied to passage I26 by the feed valve device I24 will then flow to passage 23! through which it is supplied to the feed valve device 36. The feed valve device 36 will then operate to reduce this pressure to a desired degree, such as one hundred and fifty pounds, and supply fluid at such reduced pressure to passage 245.

Fluid under pressure thus supplied to passage 245 in the bracket 34 will unseat check valve 42 against the spring 342 and flow to passage 286 and thence into valve chamber 285 of the dump supply valve device 39, until such pressure in said chamber is increased to a chosen degree, corresponding to the force of said spring on said check valve 42, at which time said spring will close said check'valve. It will be noted that-the valve 281 in the dump supply valve device 39 is, at this time, closed by fluid under pressure supplied from passage I95 through the sequence valve device 31 to passage 254, as before described.

At the same time, fluid from passage 245 wil also flow through the adjustable choke 44 to passage 348 and thence past the check valve M to passage 383, from which it will flow in one direction through the shuttle valve device 325 to pipe 321 and thence to the direct bounce chambers 32 and safety spaces 33 in the gas generator I. Fluid supplied to passage 383 will also flow in the opposite direction to chamber 382 in the dump exhaust 'valve device 48 and therein act on diaphragm 38I' to move it against spring '3I9 into contact with stop 3H, and during such movement actuate the ,bias spring 32I to seat the valve -3I4 for closing communication between passages 289 and '3I6. Fluid from passage 383 will also flow past check valve 43 to passage 278 and thence to the timing volume 45 and to the closed valve chamber 280 in the vent valve device 38 and to chamber 266 in the sequence valve device 31. I

After a desired pressure of fluid is thus obtained in chambers 32 and the cushion spaces 33in the gas generator I and in the sequence volume '45 as above described, said pressure acting in chamber 266 in the sequence valve device 3'! will overcome the opposing force of spring 2' and urge the valve 258 out of contact with the seat rib 261. As soon as the valve 268 is thus opened fluid will promptly flow from chamber 266 into chamber 289 and become effective'over the Whole lower area of diaphragm 246 for creating a force to so overbalance the opposing force of spring 211 as to snap the diaphragm 246 in an upwardly direction for moving the valve 255 out of engagement with seat 256 and into contact with seat 258; This operation of valve 255 will cut ofi further flow of fluid under pressure to passage 254" leading to pistonchamber 298 in the dump supply valve de--' vice 38 and open saidchamber to the atmospheric passage 251, whereupon the pi'essureof fluid'in said chamber will be promptly release'd to" atmosphere. Spring 2 99 will then meve'the piston 291 to the position in'which it' is shown'in the drawing for unseatingth'e va1ve287', whereupon fluid under pressure inpassage 2 8'6-will flowfto passage 289 and thence through pipes- -2 98-and '38 to -pistonchambers28 inthef starting v devices 24. 'I'he pressure of fluid thus provided in piston" 

